I think the middle one was meant to evoke the idea of slow incineration. Perhaps such that it might take a whole day. That one might have just been a fluke, maybe that one was made up by my unconscious because I knew the word "grill" in English. There wasn't an extra word there, though. I tried looking around at the words, and I think it was "grillen tag," but I'm pretty sure it's not a valid phrase.